You will begin by unbolting the back cover to access the electronics board. Make sure that all power is off before beginning this process.
To begin, unscrew the bolts on the back cover and remove it by lifting the cover upwards and towards you. Be sure to remove the cover slowly to avoid tearing the wires.
You will need to disconnect the fan's wire plug at the top of the board. It's the black and red cord at the very top. Disconnect it by firmly pulling on the white white plug. Once you have disconnected that wire, you can set the cover to the side to give you room to work.
You can find more detailed instructions on how to access the electronics board here.
You can find a board wiring diagram here.
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